Paper lining apparatus for paper-making machines of the fourdrinier type



Nov. 18, 1958 FJR. SIEVERS 2,850,551

PAPER LINING APPARATUS FOR PAPER-MAKING MACHINES OF THE FOURDRINIER TYPE Filed June 15, 1956 FRED R. SIEVERS INVENTOR.

BY & i

' Arry United States Patent PAPER LINING APPARATUS FOR PAPER-MAKIN G MACHINES OF THE FOURDRINIER TYPE Fred R. Sievers, Washougal, Wash., assignor of one-half This invention relates to improvements in the paper making art and more particularly to an apparatus for applying a secondary sheet of paper to a sheet of paper made on a regular Fourdrinier paper making machine.

One of the principal objects of the invention is the provision of apparatus of this character which while applying said secondary sheet of paper will at the same time recover, without outside contamination, all of the residual water and materials used in making the secondary sheet by re-using them in re-forming said secondary sheet. The secondary sheet may be of the same quality and/or color as the primary sheet or may be of a different quality and/ or color; usually, the secondary sheet is of a higher quality than the primary sheet.

Other objects and advantages will appear as my invention is more fully hereinafter described in the following specification, illustrated in the accompanying drawing and finally pointed out in the appended claims:

In the accompanying drawing:

Figure 1 is a fragmentary diagrammatic side view of the forming end of a paper making machine of the Fourdrinier type showing my invention operatively applied thereto.

Figure 2 is a top plan view on an enlarged scale of a lining-forming roll made in accordance with my invention and with fragments broken away for convenience of illustration.

Figure 3 is a sectional end view taken along the line 3-3 of Figure 2.

Figure 4 is a perspective view of the lining-forming roll shown associated with a flow box, a fragment of one 'wall of which is shown broken away.

Figure 5 is an end view of a modification of the liningforming roll shown in Figure 2 and with a fragment of one of its end walls broken away to reveal internal parts.

Figure 6 is an end view of a vertically movable support for either of the lining forming rolls.

Referring now more particularly to the drawing and initially to Figure 1, reference numeral 1 indicates a forming wire upon which a paper web 2 is formed as the paper stock flows from the usual head box (not shown). The forming wire is of endless form and entrained over a breast roll (not shown) and a suction couch roll 3. Rotatably mounted on an upwardly yieldable support directly above the couch roll 3 is a suction roll indicated generally at 4 and divided into a plurality of compartments 5 by radially disposed longitudinal webs 6 secured at their ends to end plates 7 and 8 and having a resilient wire 9 coiled thereabout from one end of the roll to the other. The coils of the wire are preferably spaced apart approximately one-eighth of an inch for convenience in stitching or stapling thereto an outside cylindrical covering 10 of wire mesh or its equivalent. The webs 6, for stability, are interconnected near their inner ends by any desired number of cross members 11 in the form of rods or narrow plates spaced at suitable intervals throughout the length of the webs and secured thereto in any approved manner. The inner marginal edge of each web is provided throughout its length with a flexible seal 12 secured to the web by riveting or the like and at all times in wiping contact with the outer periphery of a stationary suction tube 13 perforated as at 14 throughout of its circumference and throughout its entire length. One end of the tube 13 is connected to a flexible suction tube 13A and its opposite end is sealed by an end plate 13B. Thus, as illustrated diagrammatically in Figure 1, suction will be directed into the compartments from A to B in a counter clockwise direction as the roll 4 is rotated with the suction couch roll 3 in relation to the stationary suction box 15 of the couch roll for purposes to be more fully hereinafter pointed out.

The lining-forming roll 4 is rotatably mounted upon the hollow suction tube 13 by means of bearings 16 and 17 secured in any approved manner by their flanges 18 and 19 to the end walls 7 and 8 respectively of the roll. The ends of the tube 13 are fixedly secured by suitable shackles 20 to beams 21 each of whose one end is slidably and pivotally attached as at 22 to a standard 23 secured to each side member 24 of the paper making machine. The opposite end of each beam is provided with a pinion gear 25 interconnected by a common shaft 26 operable by a handle 27. Each pinion gear is at all times enmeshed with a vertical gear rack 28 suitably mounted by means of a standard 29 also secured to the sides of the paper making machine. The lining-forming roll is thus allowed freedom of vertical movement in accommodating itself to any surface irregularities in the top surface of the paper web 2, and may also be adjusted vertically and locked in any adjusted position in relation to the web 2 or held elevated out of contact therewith by pawls 30 selectively engageable with the pinion gears 25. a

In the modified form of roll shown in Figure 5, I dispense with the flexible seals 12 and the stabilizing elements 11 by securing the inner ends of the webs 6A to 'an elongated hollow tubular hub 31-perforated as at 32 throughout its length and circumference. The hub 31 is secured to and extends beyond the end plates 7A,-8A for rotatable mounting in bearings 33 secured to the supporting beams 21. Both ends of the hub are sealed by end plates 34. A stationary suction tube 35 of lesser outside diameter than the inside diameter of the hub 31 is disposed concentrically on the interiorof the hub and extends beyond the ends thereof for fixed attachment to the supporting beams 21. One end of the suction tube 35 is sealed by an end plate 36 and its opposite end is adapted to be connected to the suction tube 13A in the same manner as the tube 13 of the roll 4. The suction tube 35 is perforated as at 37 throughout of its circumference and throughout its entire length. The internal annular space 38 between the tube and the hub is provided to accommodate seals 39 secured to and radiating from the suction tube 35 to confine suction to the compartments from AA to BB in a counter clockwise direction through the perforations 37 formed in said hub and those of the hub between the seals 39 in said clockwise direction.

Associated with either roll 4 or 4A as shown in Figures 1, 4 and 5 and carried by the beams 21 by means of supporting frames 40 is a flow box 41 for delivering a predetermined and regulatable flow of paper lining forming stock 42 from the flow box onto the wire mesh covered peripheral surface of either roll. The flow box is coextensive in length with either roll and comprises a rear wall 43, bottom wall 44, side walls 45, and an upwardly and outwardly curved front wall 46 to provide an apron 50 to overlie the peripheral surface of the roll in minimal contact therewith to permit of free rotation of the roll but at the same time prevent seepage of the stock between the surfaceof the roll and the underside of the apron.

The depth of the stock within the flow box and hence the thickness of paper lining stock applied'to the roll is controlled in the conventional manner by a capillary tube 5i, liquid level'eontrcl '52, mixing chamber 53, and flexible supply line 54 into the flow box.

The suction tube 13A is connected to a wet vacuum pump 55 which is connected to a tank5'6 into which the residual pulp mixture or paper lining forming stock is drawn from the interior of either suction roll 4 or 4A, by a pipe. The pulp mixture is drawn from the tank and tlelivered'by a pump 58 and return pipe 59 into the mix- :ing chamber 53.

As either suction roll 4 or 4A is rotated as aforesaid the pulp mixture from the flow box 41 forms a sheet of wet secondary paper on the peripheral surface of the roll and the free water is drawn from the sheet by vacuum within the compartments A to 'B or AA to BB of the suction roll. The vacuum is broken within'the compartments in reverse order as they progressively come into alignment with the suction box of the couch roll 3 and thereafter the secondary sheet is combined as at 60 with the primary sheet by cohesion and the pressure of the suction roll.

While I have shown particular forms of embodiment of my invention, I am aware that many minor changes therein will readily suggest themselves to others skilled in the art Without departing from the spirit and scope of the invention. Having thus described my invention, what I claim as new and desire to protect by Letters Patent is:

1. In a paper making machine including a couch roll having internal suction means and a breast roll and a moving forming wire entrained thereover and carrying a Wet paper web on its upper reach from which web water is extracted as the web passes over the couch suction means; the improvement comprising a paper lining forming roll having internal suction means throughout its length, the paper lining forming roll being disposed transversely of the forming wire directly above the couch suction means and being rotatably carried by a pair of beams pivotally and slidably supported at one of their ends to the sides of the paper making machine and movable vertically at their opposite ends, means carried by the sides of the paper making machine cooperating with means carried by said beams for selectively locking their said opposite ends in vertically adjusted positions, said roll being therebyadapted to move vertically with respect to the suction means in accordance with surface irregularities in the web carried by the forming wire and rotatable by frictional engagement with the web, a flow box mounted upon said beams adjacent the peripheral surface of said paper lining forming roll and adapted to deliver a predetermined and regulatable flow of wet paper lining forming stock onto said paper lining forming roll to which it is held by and from which stock water is extracted by the internal suction means of the paper lining forming roll, said paper lining forming roll comprising a cylinder of porous material closed at both of its ends by end plates and divided into longitudinal compartments by radially disposed webs extending throughout the length of the roll and secured at their ends to said end plates and along their inner edges to a suction tube secured to and extending through said end plates and rotatably mounted in bearings and sealed at both of its ends, said tube being perforated entirely about its circumference and throughout its length and thereby in open communication with the interior of said compartments, a stationary suction tube concentrically disposed within the first mentioned suction tube sealed and secured at one of its ends to one of said end plates and extending through the other and connected to a source of suction, said stationary tube being perforated through a portion of its circumference throughout its length and being of lesser outside diameter than the inside diameter of the first mentioned tube to provide an annular space between the tubes, radially disposed sealing elements carried by said stationary tube to divide said annular space into a suction area for directing suction forces to the interior of certain of said compartments and a non-suction area for sealing off suction forces to the other of said compartments whereby the rotating paper lining forming roll will apply the paper lining thus formed to the surface of the paper web above the couch suction means and whereby suction forces to the interior of said certain of said compartments will be progressively sealed ofi? by rotation of the paper lining forming roll.

2. The improvement of claim 1, including suction means in open communication with said stationary suction tube for directing suction forces thereinto and into said compartments for drawing water from the paper lining forming stock on the exterior of the paper lining forming roll, and pressure means for returning residual water and pulp from said stationary suction tube to said flow box.

References Cited in the file of this patent UNITED STATES PATENTS 1,536,610 Burnham May 5, 1925 1,682,826 Bidwell Sept. 4, 1928 2,108,231 Nash Feb. 15, 1938 

